CN103779778B - A kind of medium-wave infrared laser power stability device and antihunt means - Google Patents
A kind of medium-wave infrared laser power stability device and antihunt means Download PDFInfo
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- CN103779778B CN103779778B CN201310687652.2A CN201310687652A CN103779778B CN 103779778 B CN103779778 B CN 103779778B CN 201310687652 A CN201310687652 A CN 201310687652A CN 103779778 B CN103779778 B CN 103779778B
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Abstract
The present invention provides a kind of medium-wave infrared laser power stability device and antihunt means, wherein device includes that optical parameter oscillating laser, acousto-optic modulator, beam splitter, optical chopper, Infrared Detectors, preamplifier, lock-in amplifier, modulate circuit, A/D converter, FPGA procedure control unit and D/A converter, described acousto-optic modulator and described beam splitter are arranged in vacuum shielding storehouse；Optical parameter oscillating laser produces tunable mid-infrared laser and produces Bragg diffraction by acousto-optic modulator, diffraction light is through beam splitter light splitting, one road light output, an other road light completes opto-electronic conversion respectively through optical chopper, Infrared Detectors, preamplifier and lock-in amplifier.Use such scheme, it is achieved that at the stability contorting of middle-infrared band laser power, fill up the domestic blank controlling research at medium-wave infrared laser power stability.
Description
Technical field
The invention belongs to laser power stability technical field, in particular a kind of medium-wave infrared laser
Power stability device and antihunt means.
Background technology
Along with the development of science and technology and going deep into of research, the especially invention of low temperature radiometer makes photoradiometer
Uncertainty be improved to 10-5 magnitude, this stability just treating light-metering source power proposes the highest
Requirement.Laser is selected because of advantages such as its collimation, monochromaticity and high power densities.General
The power stability of laser instrument itself is about in the scope of a few percent, it is impossible to directly use, and needs to take
Certain steady power measure so that it is power stability reaches the level matched with low temperature radiometer.Surely
Determining laser power and mainly have two approach, one is steady by power supply adjustment, resonator cavity regulation and frequency
The method such as fixed itself realizes stablizing of laser power at laser instrument；Two is that the method fed back by light is straight
Connect and laser output beam is modulated, to offset the power fluctuation of laser Mus.The former can be power
Controlling near 1%, the latter can reach 10-4 magnitude and (see Yao Hejun et al. to send out on metering journal
Table " research of High Precision Laser Beam Power Stabilizer "), therefore this patent selects to use the side of external modulation
Method.
At present, for laser power stability aspect, there is a lot of research, and
Obtaining good effect, especially at visible light wave range, research worker is adjusted by Electro-optical Modulation, liquid crystal
The methods such as system and magneto-optic modulation achieve the high-accuracy stable to laser power and control, and its degree of stability arrives
The magnitude of more than 10-4.Having carried out the retrieval that laser power stability control technology is relevant, retrieval result is such as
Under:
1, a kind of stable LASER Light Source
The patent of invention of Chongqing Dongdian Communication Technology Co., Ltd.'s application, on April 27th, 2004, announces
Number it is CN2610533Y.Semiconductor laser output laser signal amplification circuit after testing conversion after with
Reference voltage compares process, and the signal after comparing is input in laser power feedback control circuit,
Realize the stablizing of power supply of LD laser instrument, and then realize stablizing of laser tube power.
2, magnet controlled output power of all solid-state laser stabilising arrangement
The patent of invention of Institute of Semiconductors,Academia Sinica's application, on August 24th, 2011, publication No.
For CN102163796A.Magnet controlled eyeglass translating device is utilized to move before and after driving the completely reflecting mirror of laser instrument
Dynamic change chamber is long, and then changes the loss of resonator cavity, it is achieved the change to laser output power.Output
Laser through spectroscope light splitting, a road light is as reference light, through opto-electronic conversion metering-in control system,
Control system, according to internal processes computing, calculates the long knots modification of suitable resonator, and sends phase
The driving signal of telecommunication answered accurately regulates displacement before and after magnet controlled eyeglass translating device, drives completely reflecting mirror
Move forward and backward change chamber long, thus change the cavity loss of laser cavity, compensate power swing.
3, laser beam reshaping based on LCD space light modulator, Acta Optica, May in 2012
Volume 32 the 5th phase.
Yu Xiaochen et al. method based on liquid crystal modulation has carried out the research that light power stabilising controls.Due to
LCD space light modulator (L C S L M) is with the automatically controlled nematic twisted effect of liquid crystal and automatically controlled two-fold
Penetrating effect is main operational principle, uses electrical addressing mode, changes space glazing with the change of voltage and divides
The intensity of cloth, phase place, polarization state and wavelength etc., by photoelectric conversion system the change of laser power
It is converted into the change of voltage, it is possible to realize the stability contorting of laser power.The BEOC company of the U.S. is
Through providing laser power control based on spatial light liquid crystal modulation, the effect after stablizing is fine, reaches
Arrive 10-5-10-6.
4, the research of High Precision Laser Beam Power Stabilizer
The research of the High Precision Laser Beam Power Stabilizer that Yao and army et al. deliver on metering journal, profit
With the throwing power of the bubble Ke Ersi effect modulating lasering beam of electro-optic crystal, reference signal turns through photoelectricity
Change and after processing with signal processing circuit, feed back to electrooptic modulator, compensate the change of power, at visible ray
Wave band stability reaches 10-5 magnitude.Britain NPL can provide corresponding laser power control,
Its stability is at 10-5-10-6.
5, a kind of laser cavity outer power stabilizing device and locking means
The patent of invention of Zhejiang University's application, on August 3rd, 2011, publication No. is CN102141692A.
Based on acousto-optic modulation principle, its RF drive and laser are had by the diffraction efficiency of manipulator and determine
Relation, have passed through after acousto-optic modulator by 1/2nd wave plates and polarization beam apparatus form inclined
Shake purification light path and non-polarizing beamsplitter, and a road light output, an other road light passes through light as reference light
Electric diode and stabilization control circuit process, and export modulated signal, regulate the diffraction efficiency of manipulator,
Compensate the change of power.Owing to general beam splitter is not complete to the splitting ratio of different polarization light
Invariable, therefore polarization purification light path can long polarization stability change into power become
The change feedback compensation together changing the output of laser instrument own compensates.
Prior art does not solve the stable control of medium-wave infrared wave band of laser power, in mid-infrared
The research of wave band is little, it is an object of the invention to fill up domestic in medium-wave infrared laser power stability control
The blank of system research.
Summary of the invention
The technical problem to be solved is for the deficiencies in the prior art, it is provided that a kind of medium wave is red
Outer laser power stability device and antihunt means.
Technical scheme is as follows:
A kind of medium-wave infrared laser power stability device, wherein, including optical parameter oscillating laser, sound
Photomodulator, beam splitter, optical chopper, Infrared Detectors, preamplifier, lock-in amplifier,
Modulate circuit, A/D converter, FPGA procedure control unit and D/A converter, described acousto-optic modulation
Device and described beam splitter are arranged in vacuum shielding storehouse；During optical parameter oscillating laser generation is tunable
Iraser produces Bragg diffraction by acousto-optic modulator, and diffraction light is through beam splitter light splitting, a road
Light exports, and an other road light is respectively through optical chopper, Infrared Detectors, preamplifier and lock
Phase amplifier completes opto-electronic conversion, exports the signal of telecommunication, by the signal of telecommunication through modulate circuit, A/D converter,
FPGA procedure control unit and D/A converter complete the analysis to the signal of telecommunication, calculate and process, FPGA
Procedure control unit to acousto-optic modulator, changes diffraction effect according to pre-defined algorithm output feedback modulation signal
Rate.
Described stabilising arrangement, wherein, described tunable mid-infrared laser is swashed by visible ray calibration
Regulation light path calibrated by light device.
Described stabilising arrangement, wherein, the wavelength of described tunable mid-infrared laser is in 2.5-5 μm；
The response wave length of described Infrared Detectors is in 1-5.5 μm.
Described stabilising arrangement, wherein, described Infrared Detectors is InSb liquid nitrogen refrigerating type detector
The antihunt means of the stabilising arrangement of a kind of medium-wave infrared laser power, wherein, comprise the following steps:
Step 1: producing Bragg diffraction light is two-way through pellicular beamsplitters light splitting, leads up to InSb
Infrared Detectors realizes photoelectric conversion and forms the signal of telecommunication；Another road light transmission pellicular beamsplitters, as surely
Determine the output light of system.
Step 2: the signal of telecommunication is converted into digital signal, generates power signal and feeds back to acousto-optic modulator, control
The laser processed diffraction efficiency by acousto-optic crsytal；
In described step 2, the diffraction efficiency of described diffraction light is brilliant with the transducing being carried in generation ultrasound wave
Voltage on body becomes fixing functional relationship.Described fixing functional relationship is by experimental technique matching
Obtain.The method of described matching is: first obtain diffraction efficiency=Po/Pin;Wherein, wherein, η is
Diffraction efficiency, PinFor fixing incident optical power, PoCorresponding output is recorded for correspondence；Secondly obtain and spread out
The corresponding relation formula penetrated between efficiency and RF drive is: η=cos2(k×VModulation), wherein k is
One value comprehensively determined by the optical wavelength of RF driver, acousto-optic modulator and ultrasound wave and work,
VModulationFor changing modulation voltage.Described diffraction efficiency is controlled by ultrasonic power, when ultrasonic power is sent out
During changing, diffraction efficiency also changes.
In described step 2, when the voltage being carried on the transducing crystal producing ultrasound wave changes,
Then light is changed the most therewith by the diffraction efficiency after acousto-optic modulator.
Use such scheme, it is achieved that at the stability contorting of middle-infrared band laser power, filled up state
Inherent medium-wave infrared laser power stability controls the blank of research；By non-linear modulation technology and acousto-optic
The combination of modulation technique, phase sensitive detection technology and the application of vacuum shielding technology, be greatly improved system
Performance And Reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of stabilisation systems of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
The antihunt means of medium-wave infrared laser power stability system of the present invention mainly comprise the steps that
When ultrasound wave is by acousto-optic crsytal, the refractive index of crystal produces cyclically-varying, works as ultrasound wave
When meeting certain condition, acousto-optic crsytal now is similar to a body grating.OPO laser instrument is as laser light
Source, its laser by the acousto-optic crsytal under ul-trasonic irradiation with Bragg angle incidence, produces Prague and spreads out
Penetrating, its diffraction efficiency becomes, with the voltage being carried on the transducing crystal producing ultrasound wave, the functional relationships fixed
System；Diffraction light is two-way through pellicular beamsplitters light splitting, and InSb Infrared Detectors of leading up to realizes light
Electricity converts and forms the signal of telecommunication, owing to the noise ratio at China and foreign countries' wave band is more serious, therefore, selects suitably
Chopper and lock-in amplifier carry out noise suppression to signal.The signal of telecommunication after modulate circuit and AD converter,
It is converted into digital signal, carries out at computational analysis according to certain programmed algorithm through FPGA and MCU
Reason, feeds back to acousto-optic modulator power signal, controls the laser diffraction efficiency by acousto-optic crsytal；
When the power of laser changes, by providing different modulation voltages to change diffraction efficiency, to swashing
Luminous power carries out feedback compensation, and then realizes stablizing of laser power.Diffraction due to acousto-optic modulator
Efficiency is uncertain with the functional relation of RF drive, but according to the principle of acousto-optic modulation,
Can obtain the corresponding relation between diffraction efficiency and RF drive, its relation formula is:
η=cos2(k×VModulation), wherein k be one by RF driver, acousto-optic modulator and ultrasound wave and
The optical wavelength of work comprehensively determines, it is therefore desirable to by the way of experiment, matching determines this functional relationship.
Experimental program: fixing incident optical power Pin, change modulation voltage VModulation, correspondence records corresponding defeated
Go out Po, by the functional relationship determining diffraction efficiency and radio-frequency voltage.Then according to this functional relationship,
Design suitable algorithm and be supplied to FPGA.Another road light transmission pellicular beamsplitters, as stabilisation systems
Output light, for follow-up.
In order to solve absorption in mid-infrared laser communication process in an atmosphere, loss, design a fit
Suitable shielding harness is very important, and the present invention proposes a set of vacuum system of meter, by acousto-optic modulation portion
Divide and the working environment of light splitting part becomes vacuum environment, so can be substantially reduced mid-infrared laser and pass
Issuable uncertain factor during defeated.
The light source of the present invention is the tunable laser of optically-based parametric oscillation, can meet system with parameter
The laser of the middle-infrared band 2.5-5 μm that system requires, and the laser power stability of its output is higher.
The Photodetection system of the present invention by chopper, infrared refrigeration mode detector, preamplifier,
Lock-in amplifier and vacuum shielding system composition.Detector selects InSb liquid nitrogen refrigerating type detector, its
Response wave length and responsiveness all meet system requirements；The design of preamplifier can be greatly improved sampling
Precision；Chopper and lock-in amplifier constitute noise suppressing system, it is ensured that export the pure of the signal of telecommunication
Only.High-speed data acquistion system based on FPGA ensures the acquisition process of data, and the performance for system carries
For ensureing.
The present invention mainly uses, through the iraser merit of system in the middle-infrared band of 2.5-5 μm
Rate stably can be at 0.05%(k=2) more than.
It is an advantage of the current invention that:
The present invention realizes the laser cavity external power stability contorting in middle-infrared band first, at low-temp radiating
The application aspect of the mid-infrared lights such as meter research and remotely sensed image has very important meaning.By outside sound
Technology that light modulation and negative feedback combine and vacuum shielding technology make the stability of mid-infrared laser
At 0.05%(k=2) more than, meet the scientific research requirement to laser stability.
As it is shown in figure 1, optical parameter oscillating laser produce tunable mid-infrared laser, due in red
Outer light is not for see light, so using visible ray correcting laser to calibrate regulation light path.Mid-infrared swashs
Light produces Bragg diffraction by acousto-optic modulator, and diffraction light exports through beam splitter light splitting, a road light,
An other road light enters place system before photoelectricity, respectively through optical chopper, Infrared Detectors, preposition
Amplifier and lock-in amplifier complete opto-electronic conversion, export the signal of telecommunication, and the signal of telecommunication is input to feedback system
In system, complete the signal of telecommunication is divided through modulate circuit, a/d converter, FPGA and D/A converter
Analysis calculates and processes, and FPGA, changes to acousto-optic modulator according to the algorithm output feedback modulation signal designed
Become diffraction efficiency, it is achieved the control to laser power.The wavelength of mid-infrared laser is in 2.5-5 μm, detection
The response wave length of device, in 1-5.5 μm, designs suitable sampling rate, it is ensured that power is after controlling
Stability meets design requirement.
The present invention: 1, achieve the stability contorting in middle-infrared band laser power；2, acousto-optic is passed through
Modulation and non-linear modulation combine and achieve the modulation to mid-infrared laser；3, by phase sensitive detection skill
Signal is carried out suppressing noise processed by art；4, the external world to mid-infrared light is realized by vacuum shielding technology
Interference carries out shielding processing.
Embodiment 2
On the basis of above-described embodiment, the present invention is further described, as it is shown in figure 1, in one
Ripple infrared laser power stabilising arrangement, wherein, including optical parameter oscillating laser, acousto-optic modulator,
Beam splitter, optical chopper, Infrared Detectors, preamplifier, lock-in amplifier, modulate circuit,
A/D converter, FPGA procedure control unit and D/A converter, described acousto-optic modulator and described point
Bundle device is arranged in vacuum shielding storehouse；Optical parameter oscillating laser produces tunable mid-infrared laser and leads to
Crossing acousto-optic modulator and produce Bragg diffraction, diffraction light exports, separately through beam splitter light splitting, a road light
An outer road light is complete respectively through optical chopper, Infrared Detectors, preamplifier and lock-in amplifier
Become opto-electronic conversion, export the signal of telecommunication, by the signal of telecommunication through modulate circuit, A/D converter, FPGA journey
Sequence control unit and D/A converter complete the analysis to the signal of telecommunication, calculate and process, FPGA program
Control unit to acousto-optic modulator, changes diffraction efficiency according to pre-defined algorithm output feedback modulation signal.
Described stabilising arrangement, wherein, described tunable mid-infrared laser is swashed by visible ray calibration
Regulation light path calibrated by light device.
Described stabilising arrangement, wherein, the wavelength of described tunable mid-infrared laser is in 2.5-5 μm；
The response wave length of described Infrared Detectors is in 1-5.5 μm.
Described stabilising arrangement, wherein, described Infrared Detectors is InSb liquid nitrogen refrigerating type detector
On the basis of the above, the present invention also provides for the stable dress of a kind of medium-wave infrared laser power
The antihunt means put, wherein, comprise the following steps:
Step 1: producing Bragg diffraction light is two-way through pellicular beamsplitters light splitting, leads up to InSb
Infrared Detectors realizes photoelectric conversion and forms the signal of telecommunication；Another road light transmission pellicular beamsplitters, as surely
Determine the output light of system.
Step 2: the signal of telecommunication is converted into digital signal, generates power signal and feeds back to acousto-optic modulator, control
The laser processed diffraction efficiency by acousto-optic crsytal；
In described step 2, the diffraction efficiency of described diffraction light is brilliant with the transducing being carried in generation ultrasound wave
Voltage on body becomes fixing functional relationship.Described fixing functional relationship is by experimental technique matching
Obtain.The method of described matching is: first obtain diffraction efficiency=Po/Pin;Wherein, wherein, η is
Diffraction efficiency, PinFor fixing incident optical power, PoCorresponding output is recorded for correspondence；Secondly obtain and spread out
The corresponding relation formula penetrated between efficiency and RF drive is: η=cos2(k×VModulation), wherein k is
One value comprehensively determined by the optical wavelength of RF driver, acousto-optic modulator and ultrasound wave and work,
VModulationFor changing modulation voltage.Described diffraction efficiency is controlled by ultrasonic power, when ultrasonic power is sent out
During changing, diffraction efficiency also changes.
In described step 2, when the voltage being carried on the transducing crystal producing ultrasound wave changes,
Then light is changed the most therewith by the diffraction efficiency after acousto-optic modulator.
Use such scheme, it is achieved that at the stability contorting of middle-infrared band laser power, filled up state
Inherent medium-wave infrared laser power stability controls the blank of research；By non-linear modulation technology and acousto-optic
The combination of modulation technique, phase sensitive detection technology and the application of vacuum shielding technology, be greatly improved system
Performance And Reliability.
It should be appreciated that for those of ordinary skills, can be the most in addition
Improve or conversion, and all these modifications and variations all should belong to the protection of claims of the present invention
Scope.
Claims (3)
1. a medium-wave infrared laser power stability method, uses the stabilising arrangement of medium-wave infrared laser power, shakes including optical parameter
Swing laser instrument, acousto-optic modulator, pellicular beamsplitters, optical chopper, Infrared Detectors, preamplifier, lock-in amplifier,
Modulate circuit, A/D converter, FPGA procedure control unit and D/A converter, described acousto-optic modulator and described thin film divide
Bundle device is arranged in vacuum shielding storehouse；Optical parameter oscillating laser is produced tunable mid-infrared laser and is produced by acousto-optic modulator
Bragg diffraction, diffraction light through pellicular beamsplitters light splitting, a road light output, an other road light respectively through optical chopper,
Infrared Detectors, preamplifier and lock-in amplifier complete opto-electronic conversion, export the signal of telecommunication, by the signal of telecommunication through modulate circuit,
A/D converter, FPGA procedure control unit and D/A converter complete the analysis to the signal of telecommunication, calculate and process, FPGA
Procedure control unit to acousto-optic modulator, changes diffraction efficiency according to pre-defined algorithm output feedback modulation signal；
Comprise the following steps:
Step 1: producing Bragg diffraction light is two-way through pellicular beamsplitters light splitting, and Infrared Detectors of leading up to realizes photoelectricity
Convert and form the signal of telecommunication；Another road light transmission pellicular beamsplitters, as the output light of stabilisation systems；
Step 2: the signal of telecommunication is converted into digital signal, generates power signal and feeds back to acousto-optic modulator, controls laser and passes through acousto-optic
The diffraction efficiency of crystal；
The diffraction efficiency of described diffraction light becomes the functional relationship fixed, institute with the voltage being carried on the transducing crystal producing ultrasound wave
State fixing functional relationship for be obtained by experimental technique matching；
It is characterized in that, the method for described matching is: first obtain diffraction efficiency=Po/Pin；Wherein, η is diffraction efficiency,
PinFor fixing incident optical power, PoCorresponding output is recorded for correspondence；Secondly obtain between diffraction efficiency and RF drive
Corresponding relation formula is: η=cos2(k×VModulation), wherein k be one by RF driver, acousto-optic modulator and ultrasound wave and work
The value that comprehensively determines of optical wavelength, VModulationFor changing modulation voltage.
2. medium-wave infrared laser power stability method as claimed in claim 1, it is characterised in that described diffraction efficiency is controlled by
Ultrasonic power, when ultrasonic power changes, diffraction efficiency also changes.
3. medium-wave infrared laser power stability method as claimed in claim 1, it is characterised in that in described step 2, when adding
When the voltage being loaded on the transducing crystal producing ultrasound wave changes, then light is by the diffraction efficiency after acousto-optic modulator the most therewith
Change.
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| CN104092088B (en) * | 2014-06-26 | 2017-10-20 | 华南理工大学 | The device and its method of work of single-frequency laser intensity and frequency noise are reduced simultaneously |
| CN109672084B (en) * | 2018-12-24 | 2020-07-03 | 宁波飞芯电子科技有限公司 | Radiation output device and method |
| CN111834875A (en) * | 2020-06-08 | 2020-10-27 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Cold atom interferometer cooling laser power stabilizing system and method |
| CN114002866A (en) * | 2021-10-13 | 2022-02-01 | 光奥科技（武汉）有限公司 | Combined device of optical splitter and acousto-optic modulator |
| CN114388650B (en) * | 2021-11-01 | 2023-09-22 | 天津大学 | Photoelectric detector based on topological semi-metal heterojunction and detection method thereof |
| CN114284854A (en) * | 2021-12-10 | 2022-04-05 | 西安中科微星光电科技有限公司 | Laser power control device based on spatial light modulator |
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| KR100444912B1 (en) * | 2002-01-21 | 2004-08-21 | 광주과학기술원 | Locking method and system of wavelength and optical power of optical channels in the WDM optical communication system |
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| 实现中红外激光器外稳幅的一种方法;李艳辉等;《第十一届全国光学测试学术讨论会论文（摘要集）》;20061231;摘要 * |
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